Odd
Unusual, Strange
noun, な adjective
The kanji and the word are exactly the same. That means they share meanings as well, though "odd" is getting the number one definition for this word, and strange comes in later.
The reading is actually the same as the kanji you learned. On'yomi all the way, despite being all alone. Strange!
妙だな。今日はまだお袋から電話がかかってこないよ。
It’s strange that my mother hasn’t called me yet today.